Micrometer attachment for linear scales.



"\Mqpi aa'aa No. 827,443. i PATENTED JULY-31, 1 906. v v A. F. HENRIKSON.

' MIGROMETER ATTACHMENT FOR LINEAR SCALES.

APPLICATION FILED KAY14; 1906.

I I V, 45/

' New UNITED STATES PATENui oF IoE.

AMDOL'PHVIQF. HENRIKSON, OFTRO'Y', NEW YORK,

mlcnom-zrsn ATTACHMENT on LINEAR scALEs.

To all whom it may concern:

Be it lmow'n that I, ADoLPH F. HENRIK- s0N, a citizen of the United States, residin at Tro county of Rensselaer, and State 0 ork, have invented certain new and useful Improvements in Micrometer Attach- I ments'for Linear Scales,of which the followin" is aspecification.

lhe invention relates tov such improvements; and it consists of the novel construction and combination of partshereinafter de I scribed and subse uently claimed.

Reference may e had to the accompanying drawings and the reference characters marked thereon, which form a part of this specification. Similar characters refer, to similar parts in the several figures therein.

Figure 1 of the drawings is" a view inisometi'ical perspective of my improved micrometer attachment for linear scales. Fig. 2 is a central vertical longitudinal'section' of the same. Fi 3 a cross-section of the same,

.taken on t e broken line 3 3 in Fig. 2.

All the figuresare drawn on an enlarged scale.

object of the invention is to readings of sai "scale can be supplemented by micrometrical readings. Thedevice is particularly adapted for the use ofrnechanics in setting dividers and calipers.-'

vention 'is showniin preferred form, 1 repre 'sents'tlie ,body or base-plate of the. attachnienthavingan undercut longitudinal slideway'2', ada ted to receive the-end of an ordi.

narymeta scale,fwhich is adapted to be secured therein by means of the screw 3 and thumb-nut 4, said. screw where it extends through said slideway being partly cut away i to receive the'scale, leaving on its end remote fromthenut a shoulder 5, ada ted to engage one side. ed eofthe scale an when the nut is tightens to draw'the other edge of the scale firmly-against the opposite side of the Islide'way.

lig tly. 0ml

,ul ia s ",a'slotfli in the baseplate, which stud termi-.

Specification of Letteralate'nt. Application filed May 14, 1906. Serial Ho. 816.677-

Refming to the drawings, wherein thein- Patented July 31, 1906 hates in a screw-threaded end 21, ada ted to receive a lock-nut 1]., engageable with the under side of the base-plate or an inter osed washer-plate 12, which is shown of su 'cient dimensions to at all times close theslot 9 to prevent the entrance of dust therethrough. The stud 8 is ada ted to be engaged on the side nearerthe sli eway 2 by a coil-spring 14, which .tends to force said stud and longitudinal slide 7 toward the right, as seen in Fig. 2, and said stud is en aged on the opposite side by the inner end 0 a screw 15, which extends through an aperture formed in'the end of the base-plate and fits the interiorly-screwture.- The screw 15 is provided with a head 17 in the form of asleeve or cap adapted to receive freely therewithin the end of the 03 'lindrical extension 20. The screw 15 is formed with forty threads to theinch, and the perimeter of the sleeve-cap 17 is divided into twenty-five equal parts, the subdivisions" being indicated by graduation-marks adapted to register with an index-lineon the cylindrical projection 20,- in connection with which indication-mark each of said-graduae tions represents an adjustment of the screw of .001 .ofaninch. The cylindrical projec tion 20 is also provided "with graduationmarks adapted to be read in connection withtheinner edge of the sleeve-cap 17, representing each an ad ustment of the screw of one-fortieth of an inch. The value Of'cer- .tain of the several graduation-marks may be It 1, "will thus be seen that by suitable adjustment,

indicated by figures inthe usual manner.

the sleeve-cap17 and the. cylindrical pro% in initial assion, I which is preferably indicated by zero on both jec-tion 20, the metal scale 13,in connection I with which the attachment is to be used, is

inserted in'theslideway 2-until it abuts firmly upon the neighboring end of the longitudinal IOO shde 7, in whichposition it is. locked by means of the nut 4. The desired distance is then measured from said'abuttin ledge alon ,the metalscale so far as provi ed'ior by t e aduated subdivisions thereof, and

addition thereto such minute portions of said distance as cannot be measured accu-- rately on the metal scale are measured by setting the screw 15 at the point indicated,-

which will cause a movement of the longitudinal slide 7 away from the abutting oithe metal scale to the re uired distance. The total distance will thene found by reading from thepoint previously measured on the metal scale to the edge of the longitudinal slide 7 instead of merely to theend of the metal scale. The longitudinal slide thus has the function of a movable index member of which its edge" or end adjacent to the ordinary scale constitutes the index for use in reading the measurement.

To. adapt the attachment for accurately setting dividersor calipers, I have shown the longitudinal slide 7 provided with a plurality of prick-marks at distances from its index edge corresponding each with an ordinary subdivision of the metal scale, which distance may be indicated by the proper fractional number; Thus, as shown in Fig.1, one of said prickanarlrs is represented as being" one sixteenth of an inchand the other one-tenth of an inch irom the index edge of the longitudinal slide, in setting dividers by means of the attachment the desired distance is first measured by means of the scale" and longitudinal slide as above set forth; Then if the metal scale be subdivided into sixteenths of an inch one legof the dividers is placed upon the sixteenth-inch line or mark next nearer the longitudinal slide 7 than that from which the measurement was taken, and the other leg of the dividers is adjusted toenter the prick-mark indicated by 16', Whereby the sixteenth of an inch lost by dplacing the" first leg of the dividers is regaine lacing the second leg. If the metal scale e subdivided into tenths of an inch, the'pr'ocedure is the same, except that the'prick-m'arlt indicated by 10 is employed.

The devise as above described is sufiici'ent for accurately setting ordinary dividers or calipers having two pointed legs. To adapt the attachment for setting calipers havin only one of thel'egs pointed, I have provide a transverse'slide 22; mounted by means of a dovetailed flan e 23 ina transverse slideway in the longitudinal slide The flange 23 is partly separated by a slit 24 from the body of the transverse slide, as shown in Fi' 2, and the flange and body are connected by means of a screw 25 and nut 28', so that they can be drawn together' to cause the dove tailed flange to bindin' itsslideway'a'nd lock the transverse slide against inpvement along said sii'deway and transversely of the longi tudinal slide 7. The transverseslide is ro vided with op osi'tely-facing plane sur a'ces 27 and 28 in t esamepl anewith' each other and witlix-theindex end of the lbngltudinall siide 7, eachof said surfaces being equally adapte'dwith the index end of the longitudinal slide '7 to s'er'veas an index for measurement in connection with the metal scale 13 and all of said surfaces h'ein parallel with the neighboring end surface 0 the ordinary scale when located in the receptacle affordedi'or it by the attachment, The transverse slide 22 can be shifted from the position shown by solid lines in Fig. 1 to that indicated by dotted lines in the same figure", adapting it to he used in connection with thegl aduja'tionsalong either" side or the metal scale; in adjuster r calipers haying oniy one of the legs pointe the ointed legis et upon the metal scale, as above described for ordinary dividers, after which the" other leg is set by en a ement the case of the inside calipers wit it esurfmce 28 and in the case of outside cali the surface 27 on thetrarrsyersesh e. g

Only two prick-marks are shown the longitudinal sli'de, marked, respectively, 1'6 and 16*; but said slide may heproviderl'witl any desired number of properly Inca-tedand indicated prick-marks to adapt the attaclh ment to the graduations of the ordinary linear scale in connection with which the at: tachm'ent is employed.

What I claim as new, and desire to secure by Letters Patent, is- I i 1'. In a device of the class" described, the combination with areceptacle for one end of an ordinary linear scale; of an index member" n'i'oyabiy mounted upon said receptacle i line with said scale, and screw nechanllsn'l for ad'jus'tabl'y moving said index mere-her relatively to said scale.

2". In adevice of the class described, the combination with areceptacle for one" end of an ordinary linear scaleyof an" index member movable upon said receptacle in line with said scale and rovided, at adistaneefrom its index edge corresponding with certain of the subdivisions of saidscalle, with a seat ad ated' to'receive and accurately set a pointed eg of a calipers or dividers; and screw mecllanism for adjustably moving said index member relatively to said scale. x 1

3. In a device of the class described, the combination with areeeptaciefor one end of an rdinary linear scale; and means forso curing said scale in said rece1acleof an in: dex member mounted to sli upensaid t: ceptaclle in linewith-saidscale; and having an index end ada ted to abut upon said en 1 of said sea-1e; an mechanism, comprlsingiirpart a screw, for adjustab'lg' moving said dex member away from sai scale.

4. In a device of the class described, the combination with a receptacle for one end of an ordinary linear s'cale, and means for securing thesca'letherein; of a s'li'deway in linewith said scale; a longitudinal slide movablealong said slideway and provided 'with a for moving said longitudinal slide along its transverse slideway;a transverse slide mov slideway. 1o able, along said slideway in said longitudinal In-testimony whereofeI have hereunto set slidev and provided with oppositely-facing inmy hand this 10th day of May, 1906.

deX -surfaces both in the same (plane parallel l- ADOLPH F. HENRIKSON. with the plane of the inserte end of said Witnesses: scale; means for locking said transverse slide E. M. OYREILLY;

in adjusted position; and screw mechanism J DONSBAOH. 

